Yes, the SDP, aka The Social Democratic Party, founded by David Owen in 1982. Still going!
(Not to be confused with the SNP...)
Left-of-centre and most importantly, gender-critical.
I have no affiliation with them, but if they run a candidate in my local constituency (unlikely admittedly), I will vote for them.
Disappointing that they wouldn't repeal the GRA, but the rest looks promising:
https://sdp.org.uk/policies/transgender-and-biological-sex-based-rights/